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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Wolfram Sang <wsa+renesas@sang-engineering.com>,
        Alain Volmat <alain.volmat@st.com>,
        Wolfram Sang <wsa@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 23/48] i2c: slave: add sanity check when unregistering
Date:   Mon, 10 Aug 2020 17:21:45 +0200
Message-Id: <20200810151805.359915557@linuxfoundation.org>
In-Reply-To: <20200810151804.199494191@linuxfoundation.org>
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From: Wolfram Sang <wsa+renesas@sang-engineering.com>

[ Upstream commit 8808981baf96e1b3dea1f08461e4d958aa0dbde1 ]

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Alain Volmat <alain.volmat@st.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/i2c/i2c-core-slave.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/i2c-core-slave.c b/drivers/i2c/i2c-core-slave.c
index 88959c8580ce0..f2e7e373ee478 100644
--- a/drivers/i2c/i2c-core-slave.c
+++ b/drivers/i2c/i2c-core-slave.c
@@ -62,6 +62,9 @@ int i2c_slave_unregister(struct i2c_client *client)
 {
 	int ret;
 
+	if (IS_ERR_OR_NULL(client))
+		return -EINVAL;
+
 	if (!client->adapter->algo->unreg_slave) {
 		dev_err(&client->dev, "%s: not supported by adapter\n", __func__);
 		return -EOPNOTSUPP;
-- 
2.25.1